Provided is a bus communication method between single-machine modules. The interconnection between all modules can be achieved through the internal bus communication method. In order to enhance the bus driving capability, a 54HC245 driving chip is utilized. Due to the fact that serial drawer type structures are utilized between board levels, RM222 series connector assemblies of an AIRBORN company are used to achieve hardware interconnection between the board levels. The bus communication method between the single-machine modules reduces the using number of devices and cables, reduces the weight of a measuring system and can meet light and small requirements for the measuring system in future.